Golang | Leetcode Golang题解之第90题子集II

题目：

题解：

func subsetsWithDup(nums []int) (ans [][]int) {
    sort.Ints(nums)
    n := len(nums)
outer:
    for mask := 0; mask < 1<<n; mask++ {
        t := []int{}
        for i, v := range nums {
            if mask>>i&1 > 0 {
                if i > 0 && mask>>(i-1)&1 == 0 && v == nums[i-1] {
                    continue outer
                }
                t = append(t, v)
            }
        }
        ans = append(ans, append([]int(nil), t...))
    }
    return
}